Two-stage sealing glue needle valve hot nozzle

Abstract

The utility model discloses a two section glue sealing needle valve hot nozzle, including the hot nozzle protection cover, the inside installation of hot nozzle protection cover has the copper bush of temperature increasing, the inside installation of copper bush of temperature increasing has the hot nozzle main part, the inside installation of hot nozzle main part front end has needle valve nozzle tip, be installed between the hot nozzle main part and needle valve nozzle tip and lock the cover, the outer surface of needle valve nozzle tip front end is equipped with first step groove and second step groove, second step groove is located first step groove's front, the outside of first step groove and second step groove installs first glue sealing sleeve and second glue sealing sleeve respectively, the utility model discloses through to needle valve hot nozzle in the glue material injection process and add two section glue sealing, can effectively keep the two section stable sealing between needle valve nozzle tip and hot nozzle protection cover when hot nozzle protection cover and mould water gap separate, avoid the needle valve nozzle tip and hot nozzle protection cover between the leakage of material when hot nozzle protection cover is unevenly stressed when loosening in the mold opening process.

Description

Technical Field

[0001] This utility model relates to the field of needle valve type hot runner nozzle technology, specifically a two-stage sealing needle valve hot runner nozzle. Background Technology

[0002] Consumer electronics products are characterized by their small size and light weight, making them widely used. These products are typically molded using high-speed, high-pressure injection molding processes. Injection molding machines usually employ needle valve-type hot runner nozzles for material injection. A needle valve-type hot runner nozzle is an industrial device that controls melt flow through a valve needle. Primarily used in hot runner molds, it offers precise control over injection time, shortens molding cycles, and improves product surface quality. The valve needle's opening and closing action precisely controls melt flow, allowing the gate to close before the product is fully solidified, reducing residue and improving surface smoothness. Closing the valve needle at the end of the holding pressure stage reduces molding cycle time and prevents stringing or drooling during mold opening.

[0003] Existing high-speed, high-pressure systems have very high requirements for hot runners. Conventional needle valve hot nozzles only have one sealing section. Every time the mold is opened and closed, the hot nozzle protective sleeve is subjected to a certain external force. When the mold is poorly machined and the hot nozzle protective sleeve is loose, the uneven force on the hot nozzle protective sleeve caused by mold opening and closing makes it easy for material leakage to occur when the external force is applied to the hot nozzle tip. Therefore, it does not meet the existing requirements. To address this, we have proposed a two-stage sealing needle valve hot nozzle. Utility Model Content

[0004] The purpose of this utility model is to provide a two-stage sealing needle valve hot nozzle to solve the problem mentioned in the background art that the existing high-speed and high-pressure hot nozzles have very high requirements for the hot runner. Conventional needle valve hot nozzles only have one sealing stage. Every time the mold is opened and closed, the hot nozzle protective sleeve will be subjected to a certain external force. When the mold is poorly processed and the hot nozzle protective sleeve is loosely fixed, the opening and closing of the mold will cause uneven force on the hot nozzle protective sleeve, which will easily cause material leakage when the external force is applied to the hot nozzle tip.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a two-stage sealing needle valve hot nozzle, comprising a hot nozzle protective sleeve, a heating copper sleeve installed on the inner side of the hot nozzle protective sleeve, a hot nozzle body installed on the inner side of the heating copper sleeve, a needle valve tip installed on the inner side of the front end of the hot nozzle body, a locking sleeve installed between the hot nozzle body and the needle valve tip, a first stepped groove and a second stepped groove provided on the outer surface of the front end of the needle valve tip, the second stepped groove being located in front of the first stepped groove, and a first sealing sleeve and a second sealing sleeve respectively installed on the outer sides of the first stepped groove and the second stepped groove.

[0006] Preferably, a hot nozzle flow channel is provided on the inner side of the middle part of the hot nozzle body, a needle valve body is installed on the inner side of the hot nozzle flow channel, and an injection feeding cone is provided on the inner side of the tip of the needle valve.

[0007] Preferably, a heating wire is installed between the heating copper sleeve and the hot nozzle protective sleeve, and thermocouples are fixedly installed at both ends of the heating wire. The surface of the heating copper sleeve is provided with a spiral groove, and the heating wire is arranged inside the spiral groove and along the spiral groove.

[0008] Preferably, the hot nozzle body and the hot nozzle protective sleeve are fixedly connected by a heating copper sleeve, the front end of the needle valve body passes through the hot nozzle flow channel and is inserted into the inner side of the needle valve tip, and the hot nozzle flow channel and the injection molding feed cone are connected through the needle valve tip.

[0009] Preferably, the locking sleeve is threadedly connected to the front end of the hot nozzle body, and the front end of the hot nozzle body is locked and installed to the tip of the needle valve nozzle through the locking sleeve.

[0010] Preferably, the first sealing sleeve and the second sealing sleeve are disposed between the front end of the needle valve tip and the hot nozzle protective sleeve, and the front end of the needle valve tip and the hot nozzle protective sleeve are bonded and fixed by the first sealing sleeve and the second sealing sleeve.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This invention utilizes an injection molding machine to install the front end of the needle valve hot nozzle corresponding to the sprue plate of the mold. Specifically, the injection delivery cone and the mold sprue are connected through a hot nozzle protective sleeve. The injection molding machine delivers molten rubber to the inner side of the hot nozzle channel, and under the guiding action of the needle valve tip and the hot nozzle protective sleeve, it is injected into the mold injection cavity through the mold sprue, achieving rapid rubber injection. A first sealing sleeve and a second sealing sleeve are respectively located on the outer sides of the first and second stepped grooves, fixing the needle valve tip and the hot nozzle protective sleeve in place. These first and second sealing sleeves effectively maintain a stable seal between the needle valve tip and the hot nozzle protective sleeve when they separate from the mold sprue, preventing leakage between the needle valve tip and the hot nozzle protective sleeve due to uneven stress caused by loosening during mold opening and closing. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is an exploded structural diagram of the entire utility model;

[0015] Figure 3 This is a cross-sectional structural diagram of the main body of the hot nozzle of this utility model;

[0016] Figure 4 This is a partial cross-sectional structural diagram of the present invention.

[0017] In the diagram: 1. Hot nozzle body; 2. Heating copper sleeve; 3. Thermocouple; 4. Heating wire; 5. Needle valve tip; 6. Locking sleeve; 7. Hot nozzle flow channel; 8. Injection molding feed cone; 9. First stepped groove; 10. Second stepped groove; 11. Hot nozzle protective sleeve; 12. Needle valve body; 13. First sealing sleeve; 14. Second sealing sleeve. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Please see Figures 1 to 3 This utility model provides an embodiment of a two-stage sealing needle valve hot nozzle, including a hot nozzle protective sleeve 11, a heating copper sleeve 2 installed on the inner side of the hot nozzle protective sleeve 11, a hot nozzle body 1 installed on the inner side of the heating copper sleeve 2, the hot nozzle body 1 and the hot nozzle protective sleeve 11 being fixedly connected through the heating copper sleeve 2, a needle valve tip 5 installed on the inner side of the front end of the hot nozzle body 1, a hot nozzle flow channel 7 provided on the inner side of the middle part of the hot nozzle body 1, a needle valve body 12 installed on the inner side of the hot nozzle flow channel 7, the front end of the needle valve body 12 passing through the hot nozzle flow channel 7 and inserted into the inner side of the needle valve tip 5, an injection feeding cone 8 provided on the inner side of the front end of the needle valve tip 5, the hot nozzle flow channel 7 and the injection feeding cone 8 being connected through the needle valve tip 5, the adhesive material being injected into the mold injection cavity through the mold gate under the guiding action of the needle valve tip 5 and the hot nozzle protective sleeve 11, realizing the rapid injection operation of the adhesive material.

[0020] Please see Figure 3 and Figure 4 A locking sleeve 6 is installed between the hot nozzle body 1 and the needle valve tip 5. The locking sleeve 6 is threaded to the front end of the hot nozzle body 1. The front end of the hot nozzle body 1 and the needle valve tip 5 are locked together by the locking sleeve 6. The outer surface of the front end of the needle valve tip 5 is provided with a first stepped groove 9 and a second stepped groove 10. The second stepped groove 10 is located in front of the first stepped groove 9. A first sealing sleeve 13 and a second sealing sleeve 14 are respectively installed on the outer side of the first stepped groove 9 and the second stepped groove 10. The first sealing sleeve 13 and the second sealing sleeve 14 are located between the front end of the needle valve tip 5 and the hot nozzle protective sleeve 11. The front end of the needle valve tip 5 and the hot nozzle protective sleeve 11 are bonded and fixed by the first sealing sleeve 13 and the second sealing sleeve 14. The first sealing sleeve 13 and the second sealing sleeve 14 can effectively maintain a stable seal between the two sections of the needle valve tip 5 and the hot nozzle protective sleeve 11 when the hot nozzle protective sleeve 11 is separated from the mold gate.

[0021] Please see Figure 1A heating wire 4 is installed between the heating copper sleeve 2 and the hot nozzle protective sleeve 11. Thermocouples 3 are fixedly installed at both ends of the heating wire 4. The surface of the heating copper sleeve 2 is provided with a spiral groove. The heating wire 4 is arranged inside the spiral groove and along the spiral groove. The heating wire 4 facilitates continuous heating of the rubber material through the heating copper sleeve 2 and the hot nozzle body 1, keeping the rubber material in a molten state inside the hot nozzle flow channel 7.

[0022] In summary, when using a needle valve hot nozzle for injection molding, the front end of the needle valve hot nozzle is installed in accordance with the sprue plate of the mold using an injection molding machine. That is, the injection delivery cone 8 and the mold sprue are connected through the hot nozzle protective sleeve 11. When the power is turned on, the needle valve body 12 is moved backward inside the hot nozzle flow channel 7. At this time, the hot nozzle flow channel 7 and the injection delivery cone 8 are connected through the needle valve tip 5. The injection molding machine delivers the molten rubber to the inside of the hot nozzle flow channel 7, and then, under the guiding action of the needle valve tip 5 and the hot nozzle protective sleeve 11, it is injected into the mold injection cavity through the mold sprue, realizing the rapid injection operation of the rubber.

[0023] After the injection of the adhesive, the front end of the hot nozzle protective sleeve 11 is separated from the mold gate. The front end of the needle valve tip 5 is provided with a first stepped groove 9 and a second stepped groove 10, so that the first sealing sleeve 13 and the second sealing sleeve 14 are respectively set on the outside of the first stepped groove 9 and the second stepped groove 10 and fix the needle valve tip 5 and the hot nozzle protective sleeve 11. Thus, the first sealing sleeve 13 and the second sealing sleeve 14 can effectively maintain a stable seal between the needle valve tip 5 and the hot nozzle protective sleeve 11 when the hot nozzle protective sleeve 11 is separated from the mold gate, so as to avoid uneven force when the hot nozzle protective sleeve 11 is loosened during the mold opening and closing process, which would cause material leakage between the needle valve tip 5 and the hot nozzle protective sleeve 11.

[0024] During the injection of the rubber compound, two thermocouples 3 are connected to the spirally arranged heating wires 4, and the heating wires 4, through the heating copper sleeve 2 and the hot nozzle body 1, can continuously heat the rubber compound, keeping the rubber compound in a molten state inside the hot nozzle flow channel 7.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A two-stage sealing needle valve hot nozzle, comprising a hot nozzle protective sleeve (11), characterized in that: A heating copper sleeve (2) is installed on the inner side of the heating nozzle protective sleeve (11). A heating nozzle body (1) is installed on the inner side of the heating copper sleeve (2). A needle valve tip (5) is installed on the inner side of the front end of the heating nozzle body (1). A locking sleeve (6) is installed between the heating nozzle body (1) and the needle valve tip (5). A first stepped groove (9) and a second stepped groove (10) are provided on the outer surface of the front end of the needle valve tip (5). The second stepped groove (10) is located in front of the first stepped groove (9). A first sealing sleeve (13) and a second sealing sleeve (14) are respectively installed on the outer side of the first stepped groove (9) and the second stepped groove (10).

2. The two-stage sealing needle valve hot nozzle according to claim 1, characterized in that: The hot nozzle body (1) has a hot nozzle flow channel (7) on the inner side of the middle part, and a needle valve body (12) is installed on the inner side of the hot nozzle flow channel (7). The needle valve tip (5) has an injection feeding cone (8) on the inner side of its front end.

3. The two-stage sealing needle valve hot nozzle according to claim 2, characterized in that: A heating wire (4) is installed between the heating copper sleeve (2) and the hot nozzle protective sleeve (11). Thermocouples (3) are fixedly installed at both ends of the heating wire (4). The surface of the heating copper sleeve (2) is provided with a spiral groove. The heating wire (4) is arranged inside the spiral groove and along the spiral groove.

4. The two-stage sealing needle valve hot nozzle according to claim 3, characterized in that: The hot nozzle body (1) and the hot nozzle protective sleeve (11) are fixedly connected by a heating copper sleeve (2). The front end of the needle valve body (12) passes through the hot nozzle flow channel (7) and is inserted into the inner side of the needle valve tip (5). The hot nozzle flow channel (7) and the injection molding feed cone (8) are connected through the needle valve tip (5).

5. A two-stage sealing needle valve hot nozzle according to claim 4, characterized in that: The locking sleeve (6) is connected to the front end of the hot nozzle body (1) by a thread, and the front end of the hot nozzle body (1) is locked and installed with the needle valve tip (5) by the locking sleeve (6).

6. The two-stage sealing needle valve hot nozzle according to claim 5, characterized in that: The first sealing sleeve (13) and the second sealing sleeve (14) are disposed between the front end of the needle valve tip (5) and the hot nozzle protective sleeve (11), and the front end of the needle valve tip (5) and the hot nozzle protective sleeve (11) are bonded and fixed by the first sealing sleeve (13) and the second sealing sleeve (14).

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